Thanksgiving week is finally here. If you're flying or driving, here's what you may have to deal with in the nation's weather through Sunday.

Arctic air is plunging southward this week, bringing freezing temperatures and wind chills in the teens just in time for holiday travel and Thanksgiving day..

Paris was transformed as its first winter storm of the season delivered a dusting of snow, coating the Eiffel Tower, Champ de Mars and surrounding streets in a soft, flowing blanket of white. Social media lit up with dazzling images of snow drifting through streetlights and settling on walkways, turning the city into a real-life winter wonderland.

Watch as this funnel cloud formed over the Houston, Texas area on Monday afternoon. Ominous clouds were the precursor to this formation, as a tornado watch was in effect for more than a dozen southeastern Texas counties.

It's been a warm autumn, so far. But the polar vortex is forecast to change unusually early, and that could impact your weather in December. Here's why.